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Loans and Leases Held for Investment, Net of Allowance For Loan and Lease Losses - Schedule of Components of Portfolio Segment by Class of Financing Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment $ 4,806,927   $ 2,899,126      
Allowance for loan and lease losses (303,201) $ (243,260) (144,389) $ (104,736) $ (71,081) $ 0
Loans and leases held for investment, net 4,503,726   2,754,737      
Loans pledged as collateral under the FRB discount window $ 278,400   $ 149,200      
Allowance Ratios 6.30%   5.00%      
Allowance for loan and lease losses to commercial loans and leases held for investment, excluding PPP loans, percent 6.40%   5.50%      
Consumer Portfolio Segment            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment $ 4,020,798   $ 2,021,916      
Allowance for loan and lease losses (288,138) (228,184) (128,812) (88,631) (54,058) 0
Loans and leases held for investment, net $ 3,732,660   $ 1,893,104      
Allowance Ratios 7.20%   6.40%      
Consumer Portfolio Segment | Unsecured personal            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment $ 3,642,254   $ 1,804,578      
Consumer Portfolio Segment | Residential mortgages            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment 197,776   151,362      
Consumer Portfolio Segment | Secured consumer            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment 180,768   65,976      
Commercial Portfolio Segment            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment 786,129   877,210      
Allowance for loan and lease losses (15,063) $ (15,076) (15,577) $ (16,105) $ (17,023) $ 0
Loans and leases held for investment, net $ 771,066   $ 861,633      
Allowance Ratios 1.90%   1.80%      
Allowance for loan and lease losses to commercial loans and leases held for investment, excluding PPP loans, percent 2.20%   2.60%      
Commercial Portfolio Segment | Equipment finance            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment $ 167,447   $ 149,155      
Commercial Portfolio Segment | Commercial real estate            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment 372,406   310,399      
Commercial Portfolio Segment | Commercial and industrial            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment 246,276   417,656      
Commercial Portfolio Segment | Commercial and industrial loan, PPP            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans and leases held for investment $ 89,400   $ 268,300